Polarization-independent low-pass spatial filters based on one-dimensional photonic crystals containing negative-index materials |
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| Authors: | Z Luo Z Tang Y Xiang H Luo and S Wen |
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| Institution: | (1) Key Laboratory of Micro/Nano Optoelectronic Devices of Ministry of Education, School of Computer and Communication, Hunan University, Changsha, 410082, China;(2) Department of Physics and Electronic Information, Hunan Institute of Science and Technology, Yueyang, 414004, China |
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| Abstract: | A new application of one-dimensional photonic crystals containing negative-index materials is proposed as low-pass spatial
filters. Through optimizing the parameters of defect layer, a series of polarization-independent defect modes in the zero-average-index
gap of the photonic crystals are obtained with the increase of the incident angle. Based on these defect modes, polarization-independent
low-pass spatial filters are designed. The spatial-frequency bandwidth of the spatial filters can be adjusted by changing
the period number of the defective photonic crystal structures. In addition, the effect of the losses of negative-index materials
on the spatial filters is considered. |
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| Keywords: | PACS" target="_blank">PACS 42 70 Qs 42 79 Ci 78 20 Ci |
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